Figure 1From: Possible association between common variants of the phenylalanine hydroxylase (PAH) gene and memory performance in healthy adultsMean age-adjusted verbal memory scores of WMS-R grouped by genotypes of PAH SNP rs2037639. Data are expressed as mean ± standard error. *p < 0.05, ***p < 0.001: significant differences by analysis of covariance controlling for sex and education years.Back to article page